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6. The eye: its imperfections and their prevention : comprising a familiar description of the anatomy and physiology of the organ of vision : rules for the preservation, improvement, and restoration of sight : with remarks on near sight and aged sight, on optics, and the use and abuse of spectacles, with directions for their selection

nlm:nlmuid-68020770R-bk

10. Observations on vision

nlm:nlmuid-2557044R-bk